4:1 and 8:3 are equivalent ratios -----> is false, because 4:1 is equivalent to 8:2
:11:2 and 2:11 are equivalent ratios------> is false (because, are reciprocal ratios, not equivalent ratios)
:3:1 and 9:3 are equivalent ratios ------> is true
because 3:1 multiply both sides by 3 -----> 3*3:1*3=9:3
